Device for controlling electric motor operated machine members



g- 1954 c. w. BERTHIEZ 2,685,666

DEVICE FOR CONTROLLING ELECTRIC MOTOR OPERATED MACHINE MEMBERS Filed Jan. 25, 1951 8 Sheets-Sheet l INVENTOR Charles Willi: n BERTHIEZ ATTORNEY Aug. 3, 1954 W. BERTHIEZ C. DEVICE FOR CONTROLLING ELECTRIC MOTOR OPERATED MACHINE MEMBERS Filed Jan. 25, 1951 8 Sheets-Sheet 2 INVENTQR Chiv'lcs William Ber-Hun.

Byzgzuvxumi ATTORQLEY Aug. 3, 1954 c. w. BERTHIEZ 2,635,666

DEVICE FOR CONTROLLING ELECTRIC MOTOR OPERATED MACHINE MEMBERS Filed Jan. 25, 1951 8 Sheets-Sheet 3 Wf/V/NG MOVEMENT (1050 6 MOI/{M6177 INVENTOR ChI I S Willi 2m Ber-thiez A TORNEY Aug. 3, 1954 c. w. BERTHIEZ DEVICE FOR CONTROLLING ELECTRIC MOTOR OPERATED MACHINE MEMBERS Filed Jan 25, 1951 8 Sheets-Sheet 4 INVENTOR cha /es W/l/zam Eer-fliez By M 4 7 ATTORNEY Aug. 3, 1954 c. w. BERTHIEZ 2,585,666

DEVICE FOR CONTROLLING ELECTRIC MOTOR OPERATED MACHINE MEMBERS Filed Jan. 25, 1951 8 Sheets-Sheet 5 INVE NTDR Chirles Wfl/nw Aug. 3, 1954 c. w. BERTHIEZ 2,685,666

DEVICE FOR CONTROLLING ELECTRIC MOTOR OPERATED MACHINE MEMBERS Filed Jan. 25, 1951 8 Sheets-Sheet 6 NVENTOI? Char/CS will a) B rtblez ATTORNEY c. w. BERTHIEZ 2, ,6 6 DEVICE FOR CONTROLLING ELECTRIC MOTOR OPERATED MACHINE MEMBERS 8 Sheets-Sheet 7 ab ONO Q06 INVENTOR Charles Wf/[iah Ber-f u l e 2- AT'TO R/YEY Aug. 3, 1954 c. w. BERTHIEZ DEVICE FOR CONTROLLING ELECTRIC MOTOR OPERATED MACHINE MEMBERS 8 Sheets-Sheet 8 Filed Jan. 25, 1951 t t I 2 I t mNm SR INVENTOR Charles William Berfluiez ATTORNEY Patented Aug. 3,1954

OFFICE DEVICE FOR CONTROLLING ELECTRIC MOTOR OPERATED MACHINE MEM- BERS Charles William Berthiez, Paris, France Application January 25, 1951, Serial No. 207,747

Claims priority, application France October 25, 1946 16 Claims. 01. 318-158) This invention relates to apparatus for controlling the operation of machine tools, hoisting apparatus and the like.

been utilized provided with relays controlled by contacts actuated by push buttons or other devices located at the station for energizing or de energizing the relays, these relays being effective to initiate and to control the energization and speed of a suitable motor connected to the member to be moved for effecting the desired movement thereof. More recently it has been proposed in connection with the operation of machine tools to mount the control push buttons on a control box or control panel suitably supported for movement about the machine to be operated so that the operator of the machine may carry out the controls from a position more conveniently located with respect to the member of the machine to be moved and the function which it performs than is possible when a control box or panel is located in fixed relation to the machine at a given station. Such portable control boxes or panels of the prior art may have the advantage of convenience in carrying out the control operation and of making possible closer inspection of the operation to insure greater f;-

accuracy of the machine operation and less physical fatigue of the operator in not being required to move frequently about the machine, especially in the operation of large machine-tools or the like, and other advantages. Nevertheless, with the control devices heretofore proposed, by virtue of the fact that the large number of push buttons and other elements required to be actuated by the operator have been assembled in close relation in order to limit the size of the control panel or box, careful attention to the control panel is required, whether it be on a portable box or one stationary at a given station, in order that the operator may know what buttons or other elements are to be or have been actuated and therefore what members of the machine are to be controlled or are conditioned for control and for movement thereof. Such careful attention to the panel or box and the control elements carried thereby to distinguish with certainty one element from the other detracts from the attention required to be given to the machine itself, the member thereof to be moved, the tool carried by such a movable member and the work piece upon which it is desired that such tool shall operate. Moreover, in the devices of the prior art where a substantial number of members of the machine are required to be moved each in a plurality of directions, as in a machine tool, the number of the control elements required to be operated has been so large that the number of selections to be made complicates seriously the operations necessary to carry out the control and increases greatly the attention required of the operator for this purpose.

, It is an object of the invention to provide the control box with means for operation of the machine members in accordance with predetermined settings of the control apparatus including the settings of speed control devices, preferably rheostats for controlling the speed of the motors driving the respective movable members. In such an operation provision is made for moving the respective members at a plurality of difierent speeds by means of a single handle movable to a plurality of selecting positions successively.

It is an important feature of the invention to use said handle to select the desired speed by moving said handle to a predetermined selecting position and also to control the starting and the stopping of movable machine members when said handle is set at said predetermined selecting position.

In one embodiment of the invention, the passage of said handle from one selecting position to any other selecting position is effected without controlling any speed corresponding to an intermediate selecting position.

Other objects and features of the invention will appear from the following description taken in connection with the drawings which show one embodiment of a control system including a control box. Moreover, certain structural features of the control boxes which constitute improvements upon the prior art devices will be understood from the description to be given in connection with these drawings in which:

Figure 1 is a front view of a movable control box according to one embodiment of the invention;

Figure 2 is a horizontal section on line II-II of Figure 1;

Figure 3 is a section on line III-11]: of Figure 2;

perpendicular to the face of the panel 500 for rotation to four different positions for selecting one of the four members to be moved which have been mentioned hereinabove. To select a member to be moved the tip of the arrow-shaped handle of said switch 505 is pointed towards the direction switch 559, 506, 508, 501 located on the diagrammatical representation of the movable members, that is, the table, the upright, the headstock and the carriage. On the pictorial representation converging lines 528 are drawn showing more clearly the four positions that may be assumed by the switch handle 505.

The movable member selector or switch H3 also is supported for pivotal movement on a spindle having its axis perpendicular to the face of panel 500 to four different positions with the arrowshaped handle thereof pointing to the location of the particular direction selector 535, 501, 508, 509 associated with the depicted movable member to be moved. The part played by said switch and its structure is similar to that of the switch 585, so that this switch 5l0 may be selectively positioned in the four different positions pointing along the convergent lines 525 which serve the same purpose as lines 528 of the switch 505.

The position of each of the direction controlling switches 509, 500, 501, 506 is completely independent of the position of any of the three others and is also completely independent of the position given to the two movement selecting switches 505 and 5l0 which, in their turn, are completely independent of one another. Any of these selectors may be operated, therefore, or its position changed regardless of the position occupied by the others to accomplish the desired direction of movement of the desired member to be moved, whether by automatic or "manual operation.

In connection with Figure 1, I have described the switches 506, 501, 508 and 509 as respectively constructed with push buttons 5| I, 5l2, 5l3 and 5| 4 thereon for control of the unclamping of the member selected to be moved. In connection with the wiring diagram of Figures 6 to 10 inclusive a modified form of these direction selectors 506, 558, 509 will be described in which the arrow handle thereof itself may be pushed in the direction along the pivotal axis for effecting unclamping.

With the above described selecting device it is possible to pass very easily from automatic operation to manual operation and from the movement of one member in a predetermined direction to the movement of another member in any desired direction.

The selection may be executed as a preliminary operation i. e. the choice of the member to be controlled and the choice of the direction in which it is to be moved may be carried out before starting the machine or else, on the other hand, such selection may be carried out while the machine is already running.

I will now describe with reference to Figures 4 and 5 the control lever 520 hereinabove referred to.

As apparent from Figures 4 and. 5 a lever 520 is pivotally secured to a vertical shaft 530 and is adapted to be moved in a vertical plane with a slight angular upward or downward movement around the axis of the pivot 53| When the lever 520 is released at any point it always returns to a horizontal position due to the action of a spring 532 which is wound about the pivot 53I and the ends of which engage two studs 533 and 534, stud 533 being integral with the lever 520 and stud 534 being integral with the shaft 530.

The shaft 530 to which the lever 520 is secured is operatively connected with a rotary combination switch 535 of any known type itself electrically connected through conductors arranged in a sheath 536 to the apparatus controlling the speed of operation of the movable memher being controlled (see below the description of the wiring diagram shown in Figures 6 to 10) The lever 520 may be moved in a grid 53'! comprising a horizontal slot 538 in wall 52l as shown in Figures 1 and 4 provided at its upper edge with notches 539 and at its lower edge with notches 540 located immediately below the upper notches 539. Referring in particular to Figure 1 it will be observed that the upper notch at the extreme right is marked Vm which stands for minimum feed. Reading from right to left the other notches are marked E which stands for engagement feed, notches W, Q and R representing respectively working or cutting feed, fast feed and quick return. Any two notches aligned in the same vertical plane correspond to the same feed speed, the upper notch serving to start the movement and the lower notch to stop the movement.

Lastly, it can be seen by referring in particular to Figure 4 that the inner end of the lever 520 is pivotally secured at 542 to a connecting rod 543 the upper forked end of which is pivotally secured at 544 to a cam 546 biconical in shape and adapted to slide along the shaft 530 and to actuate when moved upwardly by downward movement of lever 520 an electric impulse contact piece 54'! or to actuate when moved downwardly by upward movement of lever 520 another electric impulse contact piece 549 having contacts 549a, 5491), Fig. 9.

When the lever 525 is moved horizontally along slot 538 it rotates the shaft 539 on its vertical axis which actuates the combination switch 535 and when this lever is moved vertically downward and upward into any one of the notche of the grid 53'! it actuates respectively the two contacts 54? and 549 (see also Figure 9).

The combination switch 535 is preferably equipped with a contact piece 55L Figure 9, for stopping the movement put into play when the lever 520 is rotated between the notches marked Q (fast feed) and R (quick return).

As several speeds must not be imparted simultaneously to the member of the machine selected to be moved the control circuit as shown in the wiring diagram of Figures 6 to 10 is designed in such a manner in connection with the combination switch 535 operated by lever 520 that the control of one speed is cut off upon connecting the controlling apparatus to produce a new speed. This will be fully understood from the explanations given hereinafter in connection with the operation of the device.

In cooperation with the mechanism described in connection with Figure 4 any known positioning device may be used which may be part of the combination switch 535, this device constraining the lever 529 to maintain at all times a position to which it has been moved opposite some one of the notches. In the embodiment shown on Figure l, this positioning device is incorporated within the combination switch 535, whereas in the embodiment shown on Figures 2 and 3, it is located in the upper part of the assembly and comprises a star like part 43l 7 rigid with shaft 530. and adapted. to cooperate. with rollers 4321 carried: by arms A33 pivotally mounted'upon the'combinator frame and urged towards each other by aspring 334.

The operation of the system that has just been described is as'follows:

It will'be assumed that the machine'to be controlledis a machinetool such asthe boring and millingqmachine already referred to. Hit isnow desired to make the table .9 of this machine travel attheispeed of fast feed over a. certain length i travel, the lever.52t:has merely to be: brought ,in-position in front of the notch Q, fast feed,

raised andthen released. By this single operation the fast feedyspeed has been selected through the switchn535, the impulse contact piece 549 has been actuated closing the control circults-f the apparatus; thusthedBsired speed of fast feed has been impartedto the movable member of the machine. The. operation will be more completely described hereinafter with referenceto FiguresG-to 10.

In order to selectnow the working speed, a similaroperation is all that is required; that the lever EZHis moved along slot 538 and is positioned in. front of the notch W corresponding to working feed, thereby changing the contacts engaged within the combination switch 535. The movable. member ofthe-machin-e is then automatically operated at working speed.

Once a given feed movement has been impartedto the. selected movable member of the machine, it can. be stopped at any moment by shifting the lever. 529into the lower. notch 54% below the position of. the lever corresponding to the selected feed. This operationraises the cam 546 which actuates the contact Eel-whose function isto stop the movement. Thus, for eX- ample, ifthemachine is inoperation and its table or other movable member is movingat a previously. imparted working feed, the lever 52.0 needs merely be shifted into the lower notch fi h'hcorresponding to letter W and the member thereby .will be stopped.

In ordernow to impart a quick return stroke tothe movable member, the lever 528 is moved to-the notch'R. During. this manipulation the stopping contact 55E, Figure 9, forming part of the switch 535 is actuated, to effect the automatic stopping of the movable member which has beenmoving in the working direction at a given speed. This permits the member to start up again in the opposite direction so as to execute the return stroke as soon as the lever 529 is raised into notch 539 marked B. This return movement may be interrupted at any given moment by lowering the lever 52! into the notch 540 marked R.

In Figure: I have shown a modification of the gridof Figures 1 and 4 adapted to achieve the same. result without having to provide a specialstopping contact piece 55! in the switch 535'between the positions of the shaft 536 of this switch that are comprised between the positions corresponding to the notches Q and R.

Inthis. variation the horizontal slot 53% stops atthe intersection with the upper and lower notches Q. Another horizontal slot 553 is provided connecting the notches Q. and R but this slot 553, parallel with slot 538, is shifted downwardly with respect to the slot 538 so as to come level with the bottoms of notches 559 marked Q'andR. Therefore, when passing from Q to R the operator is first obliged to lower the lever 520 into' the lower notch 54% marked Q and thereby cause the movable member: to stop. Then, continuing along. the slot 553i until the notch 51w. marked R is reached the lever'may be raised to the level of slot 538: and continued upward into the notch 5.39 marked R to initiate the quick return stroke.

In'certain cases all the lower notches Sill-may be interconnectedso': as to form one large in dentation.

In the example described hereinabove, it'was assumed that control was to be exercisecliover various feed speeds for the same m'ovable mem'e ber of a machine butthe samesystem is appli: cable in the-case where it is desired to control in succession the movements of several difierent movable members of a machine or apparatus; each member being moreover capable of assuming various feed speeds as desired and also of moving in both directions.

In the wiring diagram shown in Figures 6 to 10 which will be more completely described here'- after, I have shown a modification-of the'control device shown in Figure 4, thi modification being different from the embodiment of Figure l in that the biconical cam: 546 is replaced by a sector 555 rigid with the lever 52!), this sectoractuating either the contact all or the two pole contacts 5495a, 54%, according to'whether the lever 52% is depressed or raised.

As concerns the contact switches Edi-and 549a,. 5481;, each of them is providedwithan actuating stem 13:18, Fig. 3, adapted to reciprocate in a sleeve 32%] that houses a ball 430 engaging theend-of' this stem. The sector 555 is secured to the innerv end of .lever 52% (see also Figure 2) and adaptedto engage one or the other ofsaid balls while the lever is raised or lowered, thus actuating either of contactst il or 553a, 5491).

Having described the main elements. of. the pendant control box shown in Figures 1 totinclusive, I willnow describe the operation ofthe control box 599 with reference to the wiring. diagram of Figures 6 to 10 inclusive which shows the electrical circuits connecting the several elements together and with the feed motors ll 5', 1 16, Ill, H8 and with the clamping motors 29], 292, 293,. 294 of the movable members of a machine tool such as a boring and milling machine.

In Figure 6 the four feed motorsare energized through a Leonard group which is controlled by. the rheostat 193, Figure 7.

The motors providing for shifting the upright 6, carriage I, headstock 8 and table of the machine which are indicated by the reference numbers H5, H6, H1 and H8 respectively have their armature windings connected in parallel to the armature of the generator I28 through the double pole contacts I35, I36, I31, 538 respectively'of contactors I36, E31, I32, I33.

The rotational direction of these motorsllfi', H6, Ill, H3 is controlled by direction selecting switches 5%, set, 508, 599 respectively, as described in connection with Figure 1, through .cir-' cuits described hereafter. These switches are provided with shafts 423, 24, 425and 426 carrying contact arms such as 136 and (for switch 508). The selection of the feed motors H5, H6, i H, I [8 to be energized is accomplished by means of member selecting switches 565 for the automatic feed movement and 5H! for the manually controlled feed movement secured by means of the control disk 570. The switch or selector 565 is provided with a shaft d2! carrying three contact arms .629, 625, 830 cooperating with three sets of studs 62L 622,623, 624 for the'arms 620, 626, 621, 628, 629 for the arms 625, 63I, 632, 633, 634 for the arm 630. The four studs of each set are positioned so as to be engaged by the respective arms when the member selector 505 is respectively set to select the member to be moved. The switch or selector I0 is provided with a shaft 422 carrying two contact arms 835 and 649 cooperating with two sets of studs 636, 837, 639, 639 for the arm 635 and 94L 642, 643, 644 for the arm 640.

The sped of the motors H5, H5, H1, H9 is adjusted by means of the rheostat I90 having three sliders I9I, I93 and I92. The slider i9i is adapted for controlling the feed speeds through the manual control disk 510, slider I93 for adjusting the so-called working feed speed and slider I92 for the so-called engagement speed feed.

The rheostat I90 is arranged in the energizing circuit of the field winding I23 of the generator I20 from the exciter armature I2! through a ci cuit comprising for the rotational direction called forward direction field winding I23, contact I63 of forward direction relay I60, armature winding of exciter 12!, contact I52 of relay I60, wire 650, rheostat I90 and wire 65! again to field winding I23. For the reverse rotational direction the circuit comprises field winding I23, contact iii! of reverse relay I55, armature winding of exciter I2I, contact I68 of relay I65, wire 650, rheostat I90, wire 65I again to the field winding I23.

In this second circuit the excitation current of the generator I20 is caused to flow in the reverse direction with respect to the first circuit. The generator armature current is thus reversed and the motors H5, H5, H1, H8 energized from this generator will then rotate in the opposite direction.

The forward and reverse relays I60 and I65 respectively have holding contacts I6I and IE5. The energizing circuits of these two relays will be explained hereinafter.

When the entire resistance of rheostat I99 is inserted into the generator field winding circuit this generator which is caused to rotate at a constant speed thereby delivers its minimum,

tion of which will be explained hereinafter.

The manually controlled feed-speed relay is indicated at BI'I. Contact 8I9 is a contact intended to make relays 30!, 802 and 803 inoperative when relay BI'I is energized.

To set up the engagement speed, slider 192 is put into operation, that is, that portion of the rheostat I90 which is located on the right-hand side of the slider I92 in Figure 7 is short circuited when contact 804 of relay MI is closed upon energizing relay 80!.

The working speed is obtained by connecting the slider I93 in the circuit by energizing the relay 802 operating the contact 805 to short circuit that portion of the rheostat which is located on the right-hand side of the slider I93 in Figure 7.

Further, the fast speed is obtained by short circuiting the whole rheostat I90 by energizing relay 803 to close its contact 806.

The manually controlled feed speed is obtained when the control disk 570 is used through positioning, according to the position of the disk 570, the slider I9I on rheostat I90, this slider being connected in circuit when contact 8 i 8 of relay 8I'I is closed upon energization of relay BI'I.

The adjustment of the respective positions of the sliders on the rheostat may be remotely controlled through telerotators or receiver motors 290, 205, 202, e. g. of the Selsyn synchronously controlled type. Thus the manually controlled slider I9! is actuated by rotating the screw I94 driven by the receiver 200 connected by wires I553 to the transmitter 20I on the shaft 5'II on which control disk 570 is fastened. Movement of slider 593 takes place through rotating the screw E93 driven by the receiver 205 connected through wires 655 to the transmitter 206 on the shaft of which is fastened the operating knob III. On this shaft also is mounted the grauated drum 289 for directly indicating the selected working speed as described in connection with Figures 1 to 3. Slider I92 is adjusted by means of the screw I95 rotationally driven by the receiver 202 connected through wires 657 to the transmitter 203 on the shaft of which is fastened the operating knob III). The graduated drum 208 also is mounted on this shaft and shows directly the corresponding engagement speed as described in connection with Figures 1 to 3.

The automatic operation at minimum speed, engagement speed, working speed, fast" speed and quick return stroke speed is accomplished by actuating the lever 520 pivotally connected to the vertical shaft 530, Figures 9 and 4. This lever may be moved in the grid 531 shown in dotted lines in Figure 9 in two directions, hori zontally in the slot 538 Figures 9 and 5 about the vertical axis of shaft 538 and vertically about the pivotal axis 53I when the lever is so positioned as to register with one of the notches 539 or 540 designated in Figures 9 and 4 by Vm, E, W, Q and R which correspond to the above mentioned feed speeds respectively.

When the lever 520 is moved to a position to register with any of the notches E, W, Q the speed cam 660, Figure 9, engages respectively the corresponding switches 56I, 862, 663.

When the lever 520 is raised within any of the notches, the sector 555 carried by this lever at the opposite end from the end thereof which projects through the wall 52I of the box 499 is lowered so that the two pole switch 549 at its contacts 549a, 54% is closed, Figures 9 and 4. Conversely, when the lever 520 is lowered in a notch 540, the switch 541 is opened by the sector as it moves upwardly. The spring 532 is provided, as in Figure 4 for ensuring the automatic return of the lever 520 to its horizontal position in which switch 549 is opened and switch 547 is closed.

The horizontal rotary movement of the lever 520 will also cause the cam member 665 to rotate, this cam being so formed with respect to two switches 66'! and 833 that when one of these switches is closed by the cam 665 the other is open. The cam 665 is arranged on shaft 530 in such relation to cam 660 and the locations of the contacts actuated by these cams is such that the switch 669 for quick return actuated by cam 660 is closed at the same time as switch 668 is closed by cam 665.

The switch 55! is arranged between the "fast speed switch 663 and the quick return stroke switch 669 and is connected in series with the stop switch 541m the holding circuit of relays i!) and 155 for preventing any sudden change from forward to return speed and vice-versa.

Thecontrol member for manually controlling the feed motion is the disk 515 which, as indicated hereinabove, is mounted on the shaft 5? I of transmitter 25! for adjusting the position or" slider E9! on rheostat i513. The shaft 5' also is connectedwith the cam 582, Fig. 9, adapted to operate switches .5753, 5H, 612, 513 and 5'55. This cam532 is shown in the position corresponding to the neutralposition of the disk 5') in which the front .contacts 51!], Eli and are opened while theback contacts 5'53 and Bid are closed. The contacts 510,51 i. are carried by cam follower 515 engaged .on notchtlii. Contacts 612, 613, 5'15 are carried by. cam follower 421 engaged on notch (WE. Immediately after the disk has been moved from its neutralpositicn so that cam followers 515, 42? are forcedoutwardlyby the cam 582; the front contacts .510, fill, 512 which were open will be closed and back contacts 553, 5%, will be p ned.

The contactors iLJl, l3l, .i32 and 133 for the four feed motors areconnected respectively to the contact studs 52!, 522, .523, 624 for contact arm 52 5 of the member selector 50,5 (automatic operation) bi means of wires 675 andiill and respectivelyjo the contact studs 55!, 652, 563,655 of the contact arm tilt of the member selector SIB (manually controlled operation) through the wires Eliiand 618.

On terminal of each of these contactors is directly connected to the phase R of the threephase supply and the other terminal thereof is connected as stated inthe precedingparagraph to the respective contact studs of the contact arms 528, 6 3;] respectively of the two member selectors and thence through a circuit comprising the wire 619 and contact 673 for selector 505 and wire 585 and contact 672 for selector 5m both returning through the wiretBl to phase T of the .supply.

The input terminals of the relays l 55, i 65 controlling the rotation of the motors H5, H5, H1, H8 respectively in the forward or reverse direction are directly connected to-the phase B of the supply while their output terminals are connected respectively through wires'682 and 583 to the direction selectors 596, 55?, 558, and 559 and through circuits which presently will be described in the description of the operational sequence.

The hereinabove described control box operates as follows:

The electrical circuits involved may be traced on the wiring diagram formed b Figures 6 to 10 taken together.

When the machine is in its inoperative condition, the control disk El i] is in its inoperative position so that the contacts 676, fill andfilz are openwhile the contacts-6T3 and 674 are closed.

The member selectors 555 and 516 as well as the direction selectors 556, 507, 508, 509 may have been left in any position. The automatic operation speed selecting lever 529 may have been left positioned so as to register with any of the notches Vm, E, W, Q or R. Ordinarily all the movable members will have, remained clamped except the memberinvolved in the last operation of the machine, for instance, the table 9.

It will be assumed that the operation to be carried out next is to move the headstock 3 toward the right on the carriage I through an automatic operation feed movement. The member 112 selector 595 is rotated to the positionin which the arrow-shapedhandle of this selector will be directed toward the diretcion selector 558 located on the pictorial representation of the headstock 8, Figure 1. The direction selector5ii8 is rotated so as to direct the arrow head formed by its handle to the right which is the desired direction of movement of the headstock This selector handle 558 then is pressed axially to close the headstock unclamping contact 43, thus causingcontactor 355 to be energizedand hence the closing of its contacts tit, Bil, SIS and 515. By closing the contact the holding circuit of contactor 3 i 5 is maintained after the selector 553 is released from axial pressure. The closing of contacts3l'i, 3E3, 3H9 will energize the motor 293 in the .unclamping rotational direction; the nut 532 will be moved to the left, Figure 10, and when the member is unclamped it will open the switch 335 which is in the holding circuit of contactor 3l5 with contact 3 56, thus cutting thi holding circuit and stopping the motor.

The control panel is now checked to ascertain whether all other movable members are suitably clamped. Thus, in the case contemplated, the operator will depress the button 94 to efieot clamping of the table 9. Pressing of button 94 eifects the clampingof the table which was previously unclamped and will cause contactor M0 to be energized through the closed contact I20. The energization of contactor Hit will then close the contacts l'ill, F52, E03, 104. The closing of contact it: will maintain the holding circuit of contactor 705 after the push button 94 has been released. Upon closing of the contacts M2, :53, W4 the motor 294 will be energized for the reverse rotationaldirection to produce a movement towards the right in Figure 13 of nut 122. In this movement this motor will therefore cause the table 9 to be clamped and on reaching the end of its movement, the nut 122 will open the limit switch 720, thus deenergizing the contactor Hi5 and stopping the motor 294 while concomitantly closing the contact 721 which will switch on the pilot lamp 344 thereby indicating that the table 9 1s suitably clamped.

The operation of selector 505 to pointits arrow toward the direction selector 558 will connect the corresponding feed motor Ill for the headstock 8 to the terminals or the generator I20 upon closing contacts l3? when contactor i32 controlling the connection of motor I I1 is energized. Contactor I32 is connected, on the one hand, to the R phase of the supply and, on the other hand, to the T phase thereof through the circuit comprising the respective wire 676, corresponding wire 67?, contact stud 623, brush contact 620 of member selector 555, wire 679, closed contact N3 of the manual operation device, wire 55! and phase T.

The setting of the direction selector 5% pointing toward the right (Figure 8) brings the brush contacts and T35 respectively into engagement with the contact studs 13! and 736. These brush contacts and E35 in cooperation with the contact studs 13!, 132 and 755, 137 control the circuits respectively to the forward-movement relay E65 and the reverse-movement relay E55. .As will be understood from the description of the circuits to follow, these brush contacts I30 and 7735 are connected in circuit with the .brush contacts 525 and 638 of the member selector 555 for conditioning the circuit for movement of the selected member in the selected direction.

However, the motor cannot start yet because 13 the generator I driven by the three phase motor II9 will rotate without load since its field winding I23 is not yet connected to the exciter I 2|, both relays I and I being still deenergized.

Let it be assumed that the values of the engagement and working speeds are respectively set to the values required and that it is desired to start a machining operation. To bring the workpiece near the tool at the fast speed, the lever 520 is brought into position in front of the notch Q (fast speed), raised and then released. By this single operation the fast speed has been selected and imparted to the selected movable member of the machine in the following manner:

When the lever 520 is brought in front of notch Q the contact 663 is closed by cam 660 which is operatively connected to the lever 520. When the lever 520 is raised in the upper notch Q, the double switch Med-54% closes which produces simultaneous energization of forward relay I60 and fast-speed relay 803 through the following electrical circuits:

(a) As concerns relay I60: supply line T, contact 614, wire 82I, contact 551, wire 822, contact 54?, wire 823, contact 549a, contact 61?, wire 691, brush 625, stud 628, wire 694, brush I30, contact stud 'I3I, wire 68 2, relay coil I60, and supply line R. The relay I60 is thus energized and the field windings I23 of the generator I20 are energized,

thus energizing the motor I I l to bring the workpiece near the tool. The energization of relay I60 causes the closing of its holding contact I6I and even though the lever 520 has been released with subsequent opening of contact 549a, relay I60 is maintained energized through the following circuit: sup-ply line T, contact 61'4, wire 82%, contact 55I, wire 022, contact 541, wire 695, holding contact I6I, relay coil I60, and supply line R;

(b) As concerns relay 803: supply line T, contact 614, wire 82I, contact 55I, wire 822, contact 541, wire 823, contact 549a, contact 54011, wire 824, contact 663, wire 825, relay coil 6 03, Wire 826, contact 8E9 of relay 8I'I, wire 02'1, supply line R. The energization of relay 803 causes the closing of its holding contact 809, and even though the lever 520 has been released with subsequent opening of contacts 549a and 54922, relay 803 is maintained energized through the following circuit: supply line T, contact 614, wire 82I, contact 55L wire 822, contact 54'], wire 695, wire 828, interlocking contact 8M of relay 802, interlocking contact 8I2 of relay 80I, holding contact 808 of relay 803, relay coil 803, wire 826, contact 8I9 of relay 8", wire 82! and supply line R.

The energization of relay 803 causes the motor II! to run at the fast speed due to the shortcircuiting of the required portion of the rheostat I90 by the principal contact 806 of relay 803.

When the workpiece has been brought sufficiently close to the tool the value of the speed is to be reduced to the engagement speed. To effect this reduction the lever 520 is brought in position in front of the notch E (engagement speed), raised in the upper notch and then released. This further movement of the lever causes contact 663 to open and BM to close. Since relay I60 is already energized, the closing of contact 549, when raising the lever, has no effect on this relay. However, the engagement speed relay 80! is energized through the following circuit; supply line T, contact 674, wire 82 I, contact 55I, wire 822, contact 541, wire 823, contact 549a, contact 54%, wire 824, contact 66I, wire 690, relay coil 80!, contact 8I9 of relay 8II, wire 82'! and supply line R. The energization of relay coil I produces the closing of contact 804, short-circuiting in the rheostat I the portion corresponding to the engagement speed. The motor III thus runs at the engagement speed. It is to be noted that the energization of the engagement speed relay 80I produces also the closing of its holding contact 801 and the opening of its two interlocking contacts 8! I and 8I2.

The energization of relay 80! is maintained in the same manner as the energization of the fast speed relay 803 by means of its holding contact through the following circuit: supply line T, contact 674, wire 82I, contact 55I, wire 822, contact 54's, wire 605, wire 828, interlocking contact 8I3 of relay 802, interlocking contact 8I6 (which is closed as hereinafter explained) of relay 803, holding contact 801 of relay 80I, relay coil 80I, contact 8| 9 of relay 8Il, wire 82'! and supply line R.

The opening of interlocking contact 8I2 of the engagement speed relay 80I causes the holding circuit (as traced above) of the fast-speed relay 803 to be cut on, which produces the de-energization of this fast-speed relay 803 and consequently the closing of its interlocking contact 806 which permits the completion of the holding circuit of the engagement speed relay BOI now energized. The de-energization of the fast-speed relay 803 destroys, of course, the fast speed switching of the rheostat.

The tool has now entered the work piece and the feed may be increased to the working speed. To obtain this speed, the lever 520 is again moved and brought in front of notch W (working speed) raised in the upper notch and released.

The change from the engagement speed to the working speed is efiected in a manner similar to the change from the fast speed to the engagement speed. The working speed relay 802 is energized and the engagement speed relay 80I is deenergized. The initiation of the energization of the working speed relay 802 takes place through the following circuit: supply line T, contact 834, wire 82L contact 55I, wire 822, contact 54?, wire 823, contact 548a, contact 549b, wire 824, contact 662, wire 83!, relay coil 802, wire 82 6, contact N8 of relay 8H, wire 82! and supply line R. The holding circuit of this working speed relay 802 is the following: supply line T, contact 510, wire 82 i, contact 55L wire 822, contact 54?, wire 695, wire 828, interlocking contact 8! l of relay 805, interlocking contact 8I5 of relay 803, holding contact 808 of working speed relay 802, relay coil 802, wire 826, contact SI!) of relay 0II, wire 827 and supply line R.

It is now supposed that the machining cut is finished and that the workpiece has to be returned quickly to its original position. For that purpose it is sufiicient to move the lever 520 horizontally to the quick return position indicated by the reference letter R and to raise it in the corresponding upper notch. Starting from any of the engagement, working, or fast speed positions, the lever 520 opens the contact 55I when it is moved to the quick return position. Since this contact 55I is located in the holding circuit of the forward relay I60, as well as of the speed-selecting relays 80I, 802 and 803, its opening causes the de-energization of any of these relays already energized.

This results, at the same time, in the stopping of the motor, since the generator field circuit is cut off, and in all the short-circuiting contacts of the rheostat to be opened, thus establishing 15 the .conditions.5for the minimum'operating speed. When the lever 521i is in the quick return position, the cam 660 closes the 'contact'SSH and since the latter is connectedacross contact 863 of the .fast speed,the raising of lever 526 in notch R :produces, asconcerns the speedrelays and their circuits, the same eiiect as the raising *of the lever in the notch Q. However, when the lever .520 was brought to the quick return position the .cam 565, operatively connected to this lever, caused the contact-81:1 to open and'668 to close. The result is that the raising of the lever 520 causes, this time, the energization of reverse relay Hi insteadiof the forward relay ldil. The current in the'fi'eid winding of the generator is then reversed, and' the motor rotates at the fast speed in the opposite direction.

To stop the movement, it is sufiicient to depress the lever into the lower notch. This movement de-energizes the reverse relay I65 by virtue of the 'openingof contact '54? which, as' previously stated, is inserted in theholding circuit of this relay.

Finally, it is apparent that when the lever 529 is in position in front of notch Vm (minimum speed) the cam 6% is thensituated on its right hand side position, looking at the sketch, in Figure '1, and consequently closes no contact. When the lever 52%] is raised in this notch the motorlwill be operated at the minimum speed since none of the speed controlling relays is energized and no portion of the rheostat is then short-circuited.

It is to be noted that whatever may be the position of the lever'520, it is possible to stop the motor by merely depressing the lever into the corresponding lower notch since this movement causes the contact 547 to be opened by the memher 555 which is operatively connected to the 'lever 528.

It is to be noted that during manual control operation of the device by means of control disk 570 relay 8H is energized and causes contact are to open, thus preventing the energization of any of the automatic speed control relays 80!, B02 and 863, since the coils of these relays are all connected-to the supply line R through the contact-819.

For moving any other movable member of the machine themember selector 595 is rotated so as to point toward the depicted member desired to be moved, that is, toward the direction selector associated with such member and this direction selector is set according to the desired direction of movement of the selected member. Before starting movement, however, the corresponding member should be unclamped for movement and the other members clamped by pressing the corresponding push buttons as already explained.

The adjustment of the engagement and working speeds as well as the starting take place exactly in the same way for the movement of any machine member.

This application is a continuation in part of the application Serial -No.'19,454 filed April 7, 1948 which was itself a continuation in part of the application Serial No. 691,362 filed August 17, 1946, now'abandoned, and Serial No. 780,670 filed October 18, 1947 also nowabandoned.

What I claim is: 1. In a device for controlling the operation of a machine member adapted to be operated at different speeds, the combination with speed selecting means determining said different speeds i n u respectively, a motor 'operatively connected to =said'machine member for driving said machine path to prevent movement in a direction parallel to said path to another selecting position, a pre-selecting member operatively connected to said handle so .as to be moved thereby when said handle is moved to and fro in said predetermined path ofmovement, a plurality' of preselecting contacts selectively actuated by said pre-selecting member when said handle is set to said selecting positions respectively, said preselecting contacts being adapted to control said speed selecting means for determining a'selected speed, a control-member operatively connected to said handle so as to'be moved thereby when said handle is moved transversely of said predetermined path of movement 'at any of said selectingpositions, a starting contact adapted to be actuated by said control'member when said handle is moved transversely of said path in one direction and adapted to energize said controlling relay, and a stopping contact inserted in said holding circuit and adapted to be actuated by said control member when said handle is moved transversely of said path in the opposite direction to de-energize saidcontrolling relay.

2. Ina device for controlling the operation of a machine member, the combination as defined in claim 1 in which saidspeed selecting means comprise a rheostat adapted to adjust the speed of said motor, said rheostat being provided with at least one slider and adapted to determine a plurality of resistances corresponding respectively to different speeds of said motor, and speed selecting relays adapted to select one of said resistances.

3. Ina device for controlling the operation of a machine member adapted to be operated at difierent speeds, the combination with speed selecting meansdetermining said different speeds respectively, a motor operable in either rotational direction for'driving said machine member at the selected speed in one direction and in the other respectively, supply means adapted to energize said motor, two controlling relaysadapted when energized to provide for energization of said motor for rotation in one direction and in the opposite direction respectively and when tie-energized to cut the supply to said motor, holding circuits'for said controlling relays, and

iholding contacts 'inserted in said holding circuits,

of a handle supportedto be movable to and fro in a predetermined path of-movement successively to a plurality of selecting positions and movable in said positions transversely of said path, means confining said handle when in a selecting position and moved transversely of said path'to prevent-movement in adirection parallel to said path to another selecting position,-a preselecting member-operatively connected to said handle so as to-be moved thereby when said handle is moved to and fro in said predetermined path of movement, a plurality of preselecting contacts selectively actuated by said pro-selecting member when said handle is set to said selecting positions respectively, said preselecting contacts being adapted to control said speed selecting means for determining a selected speed, a direction selecting member operatively connected to said handle so as to be moved thereby when said handle is moved to and fro in said predetermined path of movement, two direction selecting contacts adapted to be selectively actuated by said direction selecting memher and adapted to be electrically connected to said controlling relays respectively, a control member operatively connected to said handle so as to be moved thereby when said handle is moved transversely of said predetermined path of movement at any of said selecting positions, a starting contact adapted to be actuated by said control member when said handle is moved transversely of said path in one direction and adapted to energize the one of said controlling relays which has been selected by the selective actuation of said direction-selecting contacts, and a stopping contact inserted in said holding circuits and adapted to be actuated by said control member when said handle is moved trans versely of said path in the opposite direction to de-energize the selected controlling relay.

4.. In a device for controlling the operation of a machine member adapted to be operated at different speeds, the combination with a Leonard group comprising a motor for driving said machine member at the selected speed, a generator provided with a field winding and adapted to energize said motor, and an exciter adapted to be connected to said field winding, a rheostat adapted to adjust the current in said field winding, a controlling relay adapted when energized to connect said exciter to said field winding, a holding circuit for said controlling relay, holding contacts inserted in said holding circuit, and speed selecting relays the contacts of which are adapted to short-circuit diiferent portions of said rheostat, of a handle supported to be movable to and fro in a predetermined path of move ment successively to a plurality of selecting posi tions and movable in said positions transversely of said path, means confining said handle when in a selecting position and moved transversely of said path to prevent movement in a direction parallel to said path to another selecting position, a pre-selecting member operatively connected to said handle so as to be moved thereby when said handle is moved to and fro in said predetermined path of movement, a plurality of pro-selecting contacts selectively actuated by said pre-selecting member when said handle is set to said selecting positions respectively, said preselecting contacts being adapted to control said speed selecting relays for determining a selected speed, a control member operatively connected to said handle so as to be moved thereby when said handle is moved transversely of said predetermined path of movement at any of said selecting positions, a starting contact adapted to be actuated by said control member when said handle is moved transversely of said path in one direction and adapted to energize said controlling relay, and a stepping contact inserted in said holding circuit and adapted to be actuated by said control member when said handle is moved transversely of said path in the opposite direction to de-energize said controlling relay.

5. In a device for controlling the operation of a machine member, the combination as defined in claim 3 in which a safety contact is provided in the holding circuits of said controlling relays for de-energizing both of said controlling relays when said handle is moved from a selecting position corresponding to the rotation of said motor in one direction to a selecting position corresponding to the rotation of said motor in the opposite direction.

6. In a device for controlling the operation of a machine member adapted to be operated under a plurality of running conditions, the combination with conditioning means comprising conditioning relays determining said running conditions, holding contacts for said conditioning relays, interlocking contacts for preventing simultaneous energization of several of said conditioning relays, holding and interlocking circuits comprising said holding contacts and said interlocking contacts, and driving means comprising a motor for driving said machine member at the selected running condition, or a handle sup ported to be movable to and fro in a predetermined path of movement successively to a plurality of selecting positions and movable in said positions transversely of said path, means confining said handle when in a selecting position and moved transversely of said path to prevent movement in a direction parallel to said path to another selecting position, a pre-selecting member operatively connected to said handle so as to be moved thereby when said handle is moved to and fro in said predetermined path of movement, a pluralit; of pre-selecting contacts selectively actuated by said pro-selecting memher when said handle is set to said selecting positions respectively, said pie-selecting contacts being adapted to control said conditioning relays respectively for determining said running conditions, a control member operatively connected to said handle so as to be moved thereby when said handle is moved transversely of said predetermined path of movement at any of said selecting positions, a switch provided with a starting contact and a conditioning contact and adapted to be actuated by said control member when said handle is moved transversely of said path in one direction so as to close simultaneously said starting and conditioning contacts, said starting contact when actuated being adapted to make said driving means effective to drive said machine member and said conditioning contact being electrically connected to said preselecting contacts, and a stopping contact adapted to be actuated by said control member when said handle is moved transversely of said path in the opposite direction to make said driving means ineffective.

7. In a device for controlling the operation of a machine member, the combination as defined in claim 6 which comprises supply means adapted to energize said motor, and a controlling relay adapted to be energized when said starting contact closed. by the actuation of said control member for connecting said motor to said supply means 8. in a device for controlling the operation of a machine member, the combination as defined in claim 6 in which said conditioning means comprises also a rheostat adapted to adiust the speed or" said motor, said rheostat being provided with at least one slider and adapted to determine a plurality of resistances corresponding respectively to different speeds of said motor and said conditioning relays being adapted to select one of said resistances.

9. In a device for controlling the operation of a machine member adapted to be operated at different speeds, the combination with speed selecting relays determining said diirerent speeds rcspectively, holding contacts for said speed-selecting relays, interlocking contacts for preventing simultaneous energization of several of said speed selecting relays, holding and interlocking circuits comprising said holding contacts and said interlocking contacts, a motor operable in either rotational direction IOldliViIlg said machine member at the selected speed in one direction and in the other respectively, supply means adapted to energize said motor, and two controlling relays adapted when energized to provide for energization of said motor for rotation in one direction and in the opposite direction respectively and when de-energized to cut the supply to said motor, of a handle supported to be movable to and fro in a predetermined path of movement successively to a plurality of selecting positions and movable in said positions transversely of said path, means confining said handle when in a selooting position and moved transversely of aid path to prevent movement in a direction parallel to said path to another selecting position, a preselecting member operatively connected to said handle so as to be driven thereby when said handle is moved to and fro in said predetermined path of movement, a plurality of pro-selecting contacts selectively actuated by said pro-selecting member when said handle is set to said selecting positions respectively, said pro-selecting contacts being adapted to control said speed selecting relays respectively for determining the selected speed, a direction selecting member operatively connected to said handle so as to be moved thereby when said, handle is moved to and fro in said predetermined path of movement, two direaction-selecting contacts adapted to be selectively actuated by said direction selecting memher and adapted to be electrically connected to said controlling relays respectively, a control member operatively connected to said handle so as to be moved thereby when said handle is moved transversely of said predetermined path of movement at any of said selecting positions, a switch provided with a starting contact and a conditioning contact and adapted to be actuated by said control member when said handle is moved transversely of said path in one direction, so as to close simultaneously said startingand conditioning contacts, said starting contact being adapted to energize the one of said controlling relays which has been selected by the selective actuation of said direction selecting contacts and said conditioning contact being electrically connected to said pro-selecting contacts, and a stopping contact inserted in said holding and interlocking circuits and adapted to be actuated by said control member when said handle is moved transversely of said path in the opposite direction to de-energize the selected controlling relay and the selected speed selecting rclay.

10. In a device for controlling the operation of a machine member adapted to be operated at different speeds, the combination with a Leonard group comprising a motor for driving said machine member at the selected speed, a generator provided with a field winding and adapted to energize said motor, and an exciter adapted to be connected to said field winding, a rheostat 26 adapted to adjust the current in said field winding, a controlling relay adapted when energized to connect said exciter to said field winding, speed selecting relays the contacts of which are adapted to short-circuit various portions of said rheostat, holding contacts for said speed selecting relays, interlocking contacts for preventing simultaneous energization of several of said speed selecting relays, and holding and interlocking circuits comprising said holding contacts and said interlocking contacts, of a handle supported to be movable to and, fro in a predetermined path of movement successively to a plurality of selecting positions and movable in said position transversely of said path, means confining said handle when in a selecting position and moved transversely of said path to prevent movement in a direction parallel to said path to another selecting position, a preselecting member operatively connected to said handle so as to be moved thereby when said handle is moved to and fro in said predetermined path of movement, a plurality of pre-selecting contacts selectively actuated by said pro-selecting member when said handle is set to said selecting positions respectively, said pre-selecting contacts being adapted to control said speed selectin relays for determining a selected speed, a control member operatively connected to said handle so as to be moved thereby when said handle is moved transversely said predetermined path of movement at any of said selecting positions, a switch provided with a starting contact and a conditioning contact and adapted to be actuated by said control member when said handle is moved transversely of said path in one direction so as to close simultaneously said starting and conditioning contacts, said starting contact being adapted to energize said controlling relay and said conditioning contact being electrically connected to said pre-selecting contacts, and a stopping contact inserted in said holding and interlocking circuits and adapted to be actuated by said control member when said handle is moved transversely of said path in the opposite direc- 1 tion to de-energize said controlling relay and the selected speed selecting relay.

11. In a device for controlling the operation of a machine member, the combination as defined in claim 9 in which a safety contact is provided in series with said stopping contact, said safety contact being actuated by said pro-selecting member when said handle is moved from a selecting position corresponding to the rotation of said motor in one direction to a selecting position corresponding to the rotation of said motor in the opposite direction.

12. In a device for controlling the operation of a machine adapted to be operated under a plurality of running conditions, in combination a lever supported on a shaft for movement of said lever to and fro substantially in a, plane transversely of the axis of rotation of said shaft concomitantly with rotation of said shaft on its axis, said lever also being pivotally supported upon said shaft for movement thereof to and fro in directions transversely of said plane, a member provided with a slot located substantially in said plane for confining the movement of said lever substantially in said plane concomitantl with rotation of said shaft on said axis, said member being provided with a plurality of notches intersecting said slot at either side thereof and determining selective positions for movement of said lever transversely of said plane and preventing movement of said lever in a direction parallel to said plane when said lever is moved into the selected notch, a rotary switch operable to a plurality of positions corresponding to the respective conditions of operation of said machine for selecting a condition of operation, said switch being operatively connected to said shaft and provided with a plurality of contacts respectively actuated when said lever while rotating together with said shaft is in register with the respective notches, a pair of switches co-operating with said rotary switch respectively for initiating and for stopping the operation of the machine under a selected condition, and means operatively connecting said lever with said switches of said pair respectively to initiate operation of the machine under the selected condition upon movement of said lever into a selected notch on one side of said slot and to stop the operation of the machine upon movement of said lever into a selected notch on the other side of said slot.

13. In a device for controlling the operation of a machine adapted to be operated at a plurality of different speeds, in combination, speed selecting means connected to said machine and operable to a plurality of positions corresponding to different forward and reverse operating speeds of said machine for selecting an operating speed, control means cooperating with said speed selecting means for starting and stopping said machine, a handle supported to be movable to and fro in a predetermined path of movement successively to a plurality of speed selecting positions including a reverse selecting position corresponding respectively to the positions of said speed selecting means and movable in said positions of said handle transversely of said path, means confining said handle when in a selected position and moved transversely of said path to prevent movement in a direction parallel to said path to another selected position, means operatively con necting said handle and said speed selecting means for actuating said speed selecting means to said different speed selecting positions when said handle is moved to and fro in said predetermined path of movement, means operatively connecting said handle and said control means for actuating said control means to start said machine for operation at the selected speed when said handle is moved at the corresponding selecting position transversely of said path, and stop means adapted to be operated by said handle when said handle is moved along a part of said path disposed between a forward operating speed position and a reverse operating speed position for stopping the machine before any reversal, said means confining said handle actuating said handle in such movement along said part to operate said stop means.

14. In a device for controlling the operation of a machine adapted to be operated at a plurality of different speeds, in combination, speed selecting means operable to a plurality of positions corresponding to different forward and reverse operating speeds of said machine for selecting an operating speed, control means cooperating with said selecting means for starting and stopping said machine, a handle supported to be movable to and fro in a predetermined path of movement successively to a plurality of speed selecting positions corresponding respectively to said positions of said speed selecting means and movable in said positions of said handle transversely of said path,

a member provided with a slot located substantially in said path for confining the movement of said handle in said predetermined path of movement, said slot having a number of start notches along one of its edges and the same number of stop notches along the other edge respectively in front of said start notches for preventing movement of said handle in a direction parallel to said path when said handle is moved into the selected notch, said slot having a part offset in the direction of said stop notches in a zone located between the selective positions corresponding respectively to the forward operating speeds and a selective position corresponding to a reverse operating speed, means operatively connecting said handle and said speed selecting means for actuating said speed selecting means when said handle is moved to and fro in said predetermined path of movement, and means operatively connecting said handle and said control means for actuating said control means when said handle is moved transversely of said path at the respective forward speed selecting positions and for actuating said control means to stop the machine when said handle engages the offset part of said slot.

15. In a device for controlling the operation of a machine member, the combination as defined in claim 1 in which biasing means are provided to bias said handle towards said predetermined path of movement.

16. In apparatus for controlling the operation of a machine .1 ember at different speeds, the combination with a source of electrical supply, a motor energizable from said supply when connected thereto and capable of operating at different speeds and operatively connected to said machine member for driving said machine memher at the different speeds, and speed determining means electrically connected to said motor and operable to determine the different speeds of said motor, of a speed selecting member supported to be movable to and fro in a predetermined path of movement successively to a plurality of speed selecting positions and movable in the respective positions transversely of said path at either side thereof, a plurality of speed selecting contacts disposed along said path and actuated by said speed selecting member in the respective speed selecting positions thereof and electrically connected to said speed determining means to determine the different speeds of the motor in said respective speed selecting positions of said member, and a starting contact and a stopping contact adapted to be actuated respectively when said speed selecting member in any selecting position thereof is moved transversely of said path in a given direction and in the opposite direction, said starting and stopping contacts being electrically connected to said speed selecting contacts and to said motor respectively to start and stop said motor upon actuation of said contacts by said transverse movements of said selecting member.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,053,499 Hall Feb. 18, 1913 1,119,384 Zimmer Dec. 1, 1914 1,173,334 Amberton Feb. 29, 1916 1,450,572 Bahls Apr. 3, 1923 

